Combination doorknob and ringing device



Apr. 24, 1923. 1,452,788

E. B. CALDERWOOD COMBINATION DOORKNOB AND RINGING DEVICE 2 Shets-Sheet 2 III:

.Zzeuerafaz 510 Ji (JILDE'RWOOD etented 2%, i223.

EARL B. CALDERWOOID; OF OAKLAND) CALIFORNIA.

COMBINATION DOORKNOB AND BINGIN'G- DEVICE.

Application filed June 12, 1922. Serial no. 567,799.

The present invention, relates to improve- ,10 ments in combination door knobs and r1ng. a ing devices, and itsparticular ob ect is to provide a ringing device hidden in a door knob that will sound an alarm when the door knob is turned in either direction for the purpose of opening the door. My combination is intended to be used especially for inside doors and is constructed in such a manner that its-outer appearance does not in any way indicate that a ringing device 18 connected therewith. Simple means are-provided for rendering the ringingdevice 0perative or inoperative according to the wishes of the inhabitant of the house employing my door knobs.

'The preferred form of my invention is illustrated in the accompanying drawing, in

which Figure 1 shows a perspective outside view of my door knob; Figure 2 a v1ew 1n side elevation partlyin cross section; Flgure 3 an end view looking at it from the outside, with the bell removed and a portion shown in section substantially along line 3-3 of Figure 4; Figure 4 a cross section substantially along line 4-4 of F1gure 3;

' Figure 5 an end elevation of the ringing device looking at it from the opposite side to that of Figure 3; Figure 6 a perspective de-' tail view of a locking element; Figure 7 a detail view of a disc cooperating with said locking element; Figure 8 an end viewof a flange collar and Figure 9 aside elevation of the same. preferred form of my inventlon I wish to have it understood that various changes or modifications may be made within the scope of-the claims hereto attached without depart ing from the spirit of the invention.

My device comprises in its principal features a stationary member (1), a ring (2) actuating the doorlatch, a bell (3) 'and'a ringing mechanism inside of the bell.-

The'stationary member (1 isrigidly secured'to a collar (4) having a flange (6) thereon which is provided with a plurality 5 of points (7 adapted to grip the wood (8) of the door (9) so as to hold the collar the same firmly as on a left hand turnf 1 While I have shown onlythe' against rotation. A plate (11) secured to the door by means of screws (12) and bearing: on the surface of the flange (6) holds a to the door. The door latch (13) is actuated by means of the ring (2) which islprovided for this purpose with .a central shaft (14) secured in one closed end (16) of the ring, and provided with a longitudinal perforation (17 of square cross section adapted to engage the square member (18) connected by means not shown, with the door latch and adapted to operate the-same one right hand as well A screw. (19) adapted to be inserted through a hole (21) in the stationary member secures the shaft (14) to the member (18) the closed 'end' (16) of the ring (2) bearing on the outer end of the stationary member (1). The ring (2) may actuate the door latch on a right hand turn or a left hand turn of about degrees in the usual manner, spring means being associated with thelatch for returning the ring to its initial .position when the pressure on the same is released; Since no novel features one endof the shaft (23) supporting the driving mechanism for the ringing device.

' The other end of this shaft (22) is threaded as shown at (23) and adapted toreceive the internally threadedhub (24) of the bell (3), the marginal portion (26) of which extends into the-ring as shown in Figure 2.

The ringing mechanism is supported between the closed end (16) of the collar and a plate ('27) secured thereto in parallel and spaced relation by spacing pins (28). A spiral spring (29) having oneend secured to the shaft (22) and the otherend to one of thespacing members (28) as shown in Figure'5 serves as the driving means for the ring ing mechanism. It'is placed under tension by rotating the bell (3) clockwise andnormallylocked in that position by the locking which co-operates with a disc (32) mounted on the shaft in fixed relation to ther'atchet (33) which will be described hereafter. The disc (32) shown in detail in Figure 7 is provided with a peripheralnotch (33) adapted to'be engaged by'a tongue (34) projecting from-the lockingmember (31). When this member (31), shown'in detail inFigure 6,

tongue is engaged with thenotch it prevents 1 the disc from rotating and the tongue and the notch are normally kept in engagement by means of the spring (36) connecting the far end (37 of the locking member with the spacing member (28).

. The locking member is disengaged from the disc so as to allow the ringing mechanism to become operative by the co-operation of a curved; flange (37) on the locking member extending through a slot (38) in the closed end. of the collar, with the stationary rod supported in the stationary member (1). When the ring is turned for the purpose of opening the door the curved under surface of the flange (37) rides on the sta-- tionary rod (39) and. thereby lifts the look- :ing member out of its engagement with the notch (33) in the disc (32), thus allowing thespring (29) to operate the ringing mech anism. The rod (39), as shown in Figure 2, forms an arm of the crank (41) supported in the stationary member (1), and if the latter crank is turned the rod is thereby moved into an inoperative position thus allowing the ring to be turned for the purpose of opening. the door without ringing the bell.

' I The ringing-mechanism itself is simple in construction. As shown in Figure 3, it comprises a ratchet (42) rigidly secured to the shaft allowing the latter to be turned clockwise for the purpose of winding the to set the spring.

turn the shaft (23) counterclockwise but in spring,but engaging on a counter-clockwise turn the gear wheel, (43)through the pawl (44).

The latter gear wheel is connected through the pinion (46) the gear wheel (47 and the second pinion- (48) with the toothed wheel (49), which latter operates the pallet (51) pivoted on'the transverse pin (52) in the manner of an escapement, causing the same to oscillate on the pivot and to set inmotion'the hammer (53) which strikes the bell in rapid succession.

The operation of the device will be readily understood from the foregoing description. To windthe ringing device it is only necessary to turn the bell clockwise. Dueto the ratchet arrangement this turning motion will not eflecttheringing device but will tend The latter-would tend to doing. so 'it would have to turn the ringing mechanism including the disc (32). As soon however, as the notch (33) in the disc (32) passes underneath the tongue (34) of the locking member (31), it is engaged by the same due to the action of the spring (36) and the ringing device is thereby locked. If a person in the attempt to open the door turns the ring (2), the curved flange (37) of the locking member (31) rides an the rod (39). secured in the stationary member (1) and is lifted out of its-engagement with the disc (33) thereby releasing the ringing device, which now becomes active. When the rod (39) has been passed by the flange (37) the spring will again force the tongue (34) to engage the notch in the disc as soon as the latter passes the tongue, so that the device is'locked automatically after it has been allowed, to ring for a certain length of time, corresponding in both cases to the period of one turn of the CllSC. If it 1s desued to render the device noperative altogether it is only necessary to turn the crank (41), whereby the rod is removedfrom the flange (37) a suflicient distance so as not to engage the same.

The locking member (31) is provlded with two slots (56) and (57) engaging and Ild:

'ing on the shafts (23) and (58) respectively,

which latter shaft serves as a support for the toothed wheel (49). The flange (37) is furthermore provided with a projecting point (59) adapted to engage the teeth of the wheel (49) at the same time the tongue engages the notch of the disk (32), whereby the device is locked in two places instead of one.

I claim:

1. device of the character described,

' comprising a door knob, a spring-actuated ringing mechanism concealed thereln 1ncluding a disc having a peripheral notch, a locking member normally. engaging the notch so as to render the ringing device inthe knob is turned so as to lift the locking. member out of its engagement with the disc.

and to allow the ringing device to become active. said stationary member being. adapted'to be manually'moved into an inoperative position.

A deviceof the character described,

comprising; a shaft centrally supported.

therein having a bell, a bell ringing mechanism and disc with. a peripheral notch mounted thereon, spring means for operate ing the ringing mechanism, alocking member norm-ally engaging the-notch so as to render the ringing device inactive havinga. curved flange thereon and a stationary element engaging the flange when the knob is turned so as to lift the locking member out of its engagement with the disc and to allow' the ringing device to become active.

4. A device, of the character described,

. .msaeae comprising a shaft centrally supported therein having a bell, a bell ringing mechanismv and disc with a peripheral notch mounted thereon, spring means for operating the ringingmechanism, a locking memment engaging the flange when the knob is turned so as to lift the locking member out of its engagement with the disc and to allow ,the ringing deviceto become active, said stationary member being adapted to be manually moved into an inoperativeposition.

v EARL B. CALDERWOOD. I 

